code: def constrain_L2(x):
      return x / tf.maximum(1.0, tf.norm(x))
  
file_path: lucid/lucid/optvis/param/unit_balls.py
imports: import tensorflow
  from lucid.misc.gradient_override import use_gradient
label_desc: Use image node_id 3 for calling a global function with example usage: constrain_L2(x) and returns: unknown